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  • Users: Trebormech
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  1. Trebormech

    NBIC R-2 form requirement

    As the owner of a boiler, I have recalculated the ASME minimum wall thickness for tubing based on newer allowable stresses as allowed under NBIC 1998 Interpretation 98-14, questions 4 and 5. My question is do I necessarily have to file an R-2 form for this type of alteration where there is no...
  2. Trebormech

    Welding P1 to P5B (5%) (A217 C5 valve to A106 pipe)

    I am looking at the replacement of a check valve in a boiler feedwater line. The new valve is 5% Cr cast. The piping is A106 CS. Can this be done with the proper preheat, PWHT, and electrode selection? Is this weld even allowed in the ASME boiler code? Would there typically be a buttering...
  3. Trebormech

    Welding A217 C5 valve into a plain carbon steel line

    I am looking at the replacement of a check valve in a boiler feedwater line. The new valve is 5% Cr cast. The piping is A106 CS. Can this be done with the proper preheat, PWHT, and electrode selection? Is this weld even allowed in the ASME boiler code? Would there typically be a buttering...
  4. Trebormech

    Aqueous ammonia storage tank

    I am trying to understand the relative corrosiveness of aqueous ammonia (29%) in a carbon steel pressure vessel. I have found much reading about SCC in welds and HAZ of welds with anhydrous ammonia, but nothing for aqueous ammonia. All this is in an effort to set up and inspection program for...
  5. Trebormech

    Section II, Part D, Table 1A, Note G4 interpretation

    Regarding note G4 in ASME Section II, Part D, Table 1A, could somebody please tell me what the phrase "are enclosed within a setting" means? Thank you. Trebormech
  6. Trebormech

    ASME Section II Part D Table 1A note G4 interpretation

    Hello, fellow engineers. Regarding note G4 in ASME Section II, Part D, Table 1A, could somebody please tell me what the phrase "are enclosed within a setting" means? Thank you. Trebormech
  7. Trebormech

    PWHT and hardness testing

    Hello. I am working on the quality control for the installation of a steam header. The material is 2.25% Cr steel (P22). The header was prefabricated in a shop, but will require several field welds. Regarding PWHT of the field welds, how relevant is hardness testing as a quality control step...
  8. Trebormech

    NDE in lieu of hydrostatic testing for boiler external piping

    Is there ever a case where sufficient NDE of boiler external piping can be done in lieu of a hydrostatic test? Case in point: Installing a new steam header in a multiple boiler facility where isolation for hydrostatic test would be difficult, if not impossible, due to the number of isolation...

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